Hand pump



1N VENTOR CLARENCE 1. PARHOTT I Afro/mar May 5, 1964 c. F. PARROTT HAND PUMP Filed Oct. 15, 1962 United States Patent 3,131,646 HAND PUMP (Ilarcnce F. Panrott, Parco Products Co, Pottstown Ave. and Dotts St, Pennsbnrg, Pa. Filed Oct. 15, 1962, Ser. No. 236,458 8 Claims. (Cl. 103-188) This invention relates to hand pumps and more particularly to pumps of portable character for use with tanks, including back carried tanks, for fire fighting anddispensing of insecticides, plant food and the like.

Various hand operated pumps have heretofore been proposed for use for comparable purposes. Pumps now available are in many instances difficult to operate, or do not permit of easy access to the valves for inspection or replacement, do not have valves which are capable of easy replacement, or have objectionable characteristics.

It is the principal object of the present invention to provide a hand pump which is simple in construction, which can be readily assembled and disassembled as desired, and which is reliable in operation.

It is a further object of the present invention to provide a hand pump in which the valves are located at opposite ends thereof and are readily accessible.

It is a further object of the present invention to provide a hand pump, operated by relatively sliding telescoping sections, with which a liquid stream can be made available and directed as desired.

It is a further object of the present invention to provide a hand pump of the sliding or telescoping type having improved valves therein which are free from likelihood of corrosion.

It is a further object of the invention to provide an improved valve suitable for use in the hand pump hereinafter described, and for other purposes.

Other objects and advantageous features of the invention will be apparent from the description and claims.

The nature and characteristic features of the invention will be more readily understood from the following description taken in connection with the accompanying drawings forming part thereof, in which:

FIGURE 1 is a side elevational view of a hand pump in accordance with the invention;

FIG. 2 is a central longitudinal sectional view of the pump shown in FIG. 1;

FIG. 3 is a transverse sectional view, taken approximately on the line 33 of FIG. 2; and

FIG. 4 is a view in perspective of one of the valve as semblies employed with the hand pump shown in FIG. 2.

It should, of course, be understood that the description and drawings herein are illustrative merely, and that various modifications and changes can be made in the struc ture disclosed without departing from the spirit of the invention.

Referring now more particularly to the drawings, an intake section is provided having an internally threaded bore 11, a coaxial bore 12 extending therefirom to a transverse wall 13, a coaxial bore 14 of smaller diameter than the bore 12 with a frustoconical valve seat 15 extending therefrom, a coaxial supply bore 16 and an angularly extending feed bore 17 with an intake connector 18 extending therefrom for the connection of a supply pipe 19 which is connected to the liquid source (not shown) and which may be a back carried tank.

An outer cylinder 25 is provided having one end 26 in threaded engagement with the bore 11, and having an end face 27 serving as a stop. The other end 28 of the outer cylinder 25 is threaded for the reception of an internally threaded gland 29, which retains a sleeve guide 36 in position in engagement with an end face 31 of the outer cylinder 25. The gland 29 also serves to compress a gland 3,131,646 Patented May 5, 1964 seal 32 against the guide 30. The outer cylinder has an interior elongated cylindrical surface 33.

An inner cylinder 35 is provided slidable in the sleeve guide and concentric and coaxial with the outer cylinder 25. The inner cylinder has an internally threaded end 36 for the reception of a guide plug 37, of nylon or the like, having an outer surface for slida-ble engagement with the interior surface 33 of the cylinder 25. The guide plug 37 has a plurality of slots 38 formed thereon to permit free access of fluid past the guide plug 37 in either direction and an interior passageway 39.

The inner cylinder 35 has the other end 4-6 thereof internally threaded for engagement with a threaded extension 41 on a valve carrying head or outlet member 42.

The valve head 42 has an interior bore 43 extending to a coaxial frustoconical valve seat 44 from which an enlarged coaxial bore 45 extends to a transverse wall 46, which is at the inner end of an enlarged internally threaded coaxial bore 47.

An outlet section which serves as a closure is provided having a threaded portion 51 for engagement with the bore 47 in abutting relation to the wall 46.

The outlet section 50 has an interior valve receiving bore 52 with a valve positioning wall 53 from which a passageway 54 and bore 55 extend to the outer end for fluid discharge.

The outlet section 50 has an enlarged rim 56 for facilitating turning thereof.

The outlet section 56 has secured to the exterior thereof a hollow tubular hand grip 57 with a rear flared portion 58. The grip 57 extends along and is spaced from the inner cylinder 35 and permits movement of the outer cylinder 25 and gland 29 during relative movement of the outer cylinder 25 and the hand grip 57.

The valve assembly 60, one of which serves as an inlet valve in the intake section 10 and another of which serves as the discharge valve in the valve head 42, is shown in perspective in FIG. 3. The valve assembly 60 has a circular ring 61, end faces 62 and 63, and a central opening 64. The periphery of the ring 61 has an outer cylindrical surface 65 and a cylindrical surface 66 of reduced diameter with a wall 67 therebetween. From the ring 61 at one end of the central opening 64, two integral curved bands 68 extend to one side of a valve plug or head 69 of generally hemispherical shape and with a seating surface 70. The valve assemblies 60 can be made of any desired material but are preferably molded from flexible and resilient synthetic plastic.

The valve assembly 69 which serves as the intake valve, shown at the left of FIG. 2, has its ring end face 62 in engagement with the wall 13, has its peripheral surface 65 seated in the bore 12 and has the end 27 of the outer cylinder 25 engaging the wall 67. The sea-ting surface 7 i} engages the valve seat 15 and is movable therefrom, upon flexing of the bands 68. This valve assembly 60 by reason of its resilient ring 61 also aids in preventing fluid lealnage at the junction of the outer cylinder 25 and the inlet section M).

The valve assembly 60 which serves as the discharge valve, shown at the right of FIG. 2, has its ring end face 62 in engagement with the wall 4'6, has its peripheral surface in engagement with the bore 52, has the end face 53 of the outlet section 50 in engagement its end face 63, and has its seating surface 7 0 engaging the valve seat 44. The valve head 42 and the outlet section 50 with its bore 55 serve as a fluid delivery section.

The mode of operation will now be pointed out.

Assuming that the hose .19 is connected to a supply of liquid, the intake section lll is grasped by the user with one hand, the other hand grasping the hand grip 57. If now the cylinders 25 and 35 are extended, liquid will enter past the head 69 of the inlet valve 66 into the ina age-re creasing space between the inlet valve 60 and the guide plug 37. All the same time liquid in the space between the inner and outer cylinders and 35, and the sleeve guide and the guide plug 37 will pass freely through the slots 38 to the interior of the cylinder 25. The head 69 of the outlet valve 60 will remain seated.

If now the hand grip 57 is removed towards the intake section :10, the head 69 of the inlet valve 60 will remain seated. The decrease of volume within the outer cylinder 25 will cause liquid to pass through the interior passageway 39, the interior of the inner cylinder 35, the bore 43, past the head 69 of the outlet valve 60 which is forced open, through the central opening 54, the passageway 54 and the bore 55 for delivery as desired.

Repeated reciprocation or telescoping and extending the cylinders 25 and will effect the delivery of additional liquid through the bore 55.

It will be noted that the rear end of the inner cylinder 35 is guided in the reciprocatory or sliding movement by the guide plug 37 While the front end of the outer cylinder 25 is guided by the sleeve guide 30.

Access to the inlet valve assembly 60 for inspection or replacement can be had quickly and easily by unscrewing the threaded end 26 of the outer cylinder 25 from the bore 11 of the intake section 10. The old valve assembly 60 can be removed, a new valve 60 inserted, and cylinder 25 retightened to hold the valve assembly 66 in place and provide a seal.

Access to the outlet valve assembly 66) for inspection or replacement can be had quickly and easily by unscrewing the outlet section 59 from its engagement with the threaded bore 47. The old valve assembly 60 can be removed and a new valve assembly 66 inserted. The outlet section 50 can again be engaged and retightened to hold the outlet valve assembly 60 in place and provide a seal.

The structure will thus be seen to be particularly well adapted to carry out the objects of the invention.

I claim:

1. A portable hand pump for liquids comprising a fluid inlet section having an inlet valve seat, a fluid delivery section having a delivery valve seat, inner and outer hollow longitudinal axially aligned cylinders telescoping at their inner ends, said cylinders being respectively connected at their outer ends to said sections, the inner ends of each of said cylinders having a guide thereon in engagement with the other of said cylinders, an inlet valve assembly in said inlet section at the outer end of one of said cylinders having a holding ring retained by said cylinder end and having a valve plug for engagement with said inlet valve seatwand movable to open position for fluid inlet, said inlet section and said cylinder end being separable for insertion and removal of said inlet valve assembly, a delivery valve in said delivery section at the outer end of the other of said cylinders and movable to open position for fluid delivery, and a closure member in said delivery section engaging said delivery valve and removably retaining said delivery valve in position.

2. A portable hand pump as defined in claim 1 in which said valve seats and said cylinders are in longitudinal axial alignment.

3. A portable hand pump as defined in claim 1 in Winch one of the guides is a guide plug carried by the inner cylinder at its inner end in engagement with the interior of the outer cylinder and has openings therethrough for fluid access.

4. A portable hand pump as defined in claim 1 in which said outer cylinder at its inner end has a gland carried thereby with a packing in engagement with said inner cylinder, and one of the guides is a sleeve guide mounted in said gland and with which said inner cylinder is in sliding engagement.

5. A portable hand pump as defined in claim 1 in which said holding ring provides a seal between said inlet section and its associated cylinder, and said valve plug is provided offset from and connected to said ring by spaced resilient bands.

6. A portable hand pump comprising a fluid inlet secion, a fluid delivery section having intcriorly thereof a valve receiving head, hollow cylinders telescoping at their inner ends and connected at their outer ends to said sections, said delivery section valve receiving head having a bore therein, a valve removably mounted in said bore, and a closure detachably mounted in said bore and retaining said valve in position, said closure having a fluid discharge opening.

7. A portable hand pump comprising an intake section having an end opening, an outer cylinder detachably connected at one end thereof to said intake section at said end opening, an inlet valve member removably inserted in said end opening and having a holding ring portion retained by said cylinder end, a gland member at the other end of said outer cylinder, an inner cylinder slida'ble in said gland member and having an inner end portionslidable between said gland member and said intake section, said inner cylinder having an outer end, an outlet member closing said outer end and having an end opening, an outlet valve member removably inserted in said opening and having a holding ring portion, and a closure carried by said outlet member engaging said holding ring and removably retaining said valve member in said opening.

8. A hand pump as defined in claim 7 in which at least one of the holding rings has a central fluid opening and a valve plug is provided offset from and connected to said ring by spaced resilient bands.

References Cited in the file of this patent UNITED STATES PATENTS 125,824 Mayall Apr. 16, 1872 1,414,283 Jewell Apr. 25, 1922 2,355,862 Harper Aug. 15, 1944 2,683,060 Wise et a1. July 6, 1954 3,077,205 Butterworth Feb. 12, 1963 

1. A PORTABLE HAND PUMP FOR LIQUIDS COMPRISING A FLUID INLET SECTION HAVING AN INLET VALVE SEAT, A FLUID DELIVERY SECTION HAVING A DELIVERY VALVE SEAT, INNER AND OUTER HOLLOW LONGITUDINAL AXIALLY ALIGNED CYLINDERS TELESCOPING AT THEIR INNER ENDS, SAID CYLINDERS BEING RESPECTIVELY CONNECTED AT THEIR OUTER ENDS TO SAID SECTIONS, THE INNER ENDS OF EACH OF SAID CYLINDERS HAVING A GUIDE THEREON IN ENGAGEMENT WITH THE OTHER OF SAID CYLINDERS, AN INLET VALVE ASSEMBLY IN SAID INLET SECTION AT THE OUTER END OF ONE OF SAID CYLINDERS HAVING A HOLDING RING RETAINED BY SAID CYLINDER END AND HAVING A VALVE PLUG FOR ENGAGEMENT WITH SAID INLET VALVE SEAT AND MOVABLE TO OPEN POSITION FOR FLUID INLET, SAID INLET SECTION AND SAID CYLINDER END BEING SEPARABLE FOR INSERTION AND REMOVAL OF SAID INLET VALVE ASSEMBLY, A DELIVERY VALVE IN SAID DELIVERY SECTION AT THE OUTER END OF THE OTHER OF SAID CYLINDERS AND MOVABLE TO OPEN POSITION FOR FLUID DELIVERY, AND A CLOSURE MEMBER IN SAID DELIVERY SECTION ENGAGING SAID DELIVERY VALVE AND REMOVABLY RETAINING SAID DELIVERY VALVE IN POSITION. 